Base-exchange compound and process of making it



' and absorptive power and Patented Dec. 4, 1928.

. SIGNOR, BY MESNE ASSIGNMENTS UNITED STATES PATENT OFFICE.

Hmom; JOSEPH WHEATON, or LOWER WALTON, NEAR WARRINGTON, ENGLAND, As- TOAMERICAN DOUCIL COMPANY, or PHILA- DELPHIA, TENNSYLVAN IA, ACORP-ORATION OF PENN SYLVAll'IA.

BASE-EXCHANGE COMPOUND AND PROCESS OF MAKING IT.

No Drawing. Application filed November 3, 1921, Serial No. 512,631, andin Great Britain July 5, 1921.

- Renewed May 4, 1928.

. The object of this invention is to produce a new and efiic1entbase-exchanging compound by a new and lmproved process.

According to the said invention the said 8 base-exchanging compound isprepared by mixinga solution of sodium silicate and a solutionof sodiumaluminate under such conditions and in'such proportions that a gel isproduced which, when dried and washed, c0nstitutes a product which isinsoluble in water and is very satisfactory as'regards porosity generalefficiency as a base-exchanging compound.

The new compound according to this invention can be made as follows, so'that it contains between A1 0 4 Na,O, SSiO and grees Twaddell are mixedwith'one part by -weight of a solution of sodium aluminate of abouttwenty-five degrees Twaddelhthe said solution of sodium silicatecontaining from 30 to 40 per cent of sodium silicate having a ratio ofsodium to silica of one of sodium to from one to three and four-fifthsof silica and the solution of sodium aluminate containing fortygrammesof aluminium per litre, or thereabouts.

The gelthus produced is then dried and washed and a compound is obtainedwhich has the aforesaid properties.

This invention is not limited to details of the aforesaid example.

What I claim as my invention is ,1 The manufacture of a base-exchangingthe precise compound by mixing a solution of sodium silic'ate of about30 Twaddell, the proportion being from about 4 to 6 parts by weight,with about one part by weight of a solution of sodium aluminate of aboutTwaddell and .then in drying the gel which is produced from the entiremass of the mixed solutions and then in washing the dried product. i

'2. The manufacture of a new base-ex-- changing compound by mixing asolution of sodium silicate conta ning from to 40 per cent of sodiumsilicate, having a ratio of one of sodium to from one 'to three andfour- From four to six parts by weight of a solution ofsodium silicateof about thirty de-- ,claim 1.

4. A new base-exchanging compound which is insoluble in water, of greatporosity, and

vabsorptive power, and which contains be tween A1 0 4Na l),

8SiO and A120,, 6Na O,14SiO I name to this specification.

' In testimony whereof I have signed my HAROLD JOSEPH WHEATON,

